A Dictionary of Chemistry And the Allied Branches of Other Sciences volume 2
A Dictionary of Chemistry And the Allied Branches of Other Sciences volume 2
Henry Watts
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Dioxysulphide of Ethylene. C 2 H 4 S0 2 . (Crafts, loc. Eit. } This compound, which has the composition of hydrate of sulphethylene, -^ JO 2, or glycol in which 2 at. H are replaced by 1 at. S, or of glycolic acid in which is replaced by S, is obtained by heating protosulphide of ethylene with fuming nitric acid in sealed tubes to 150 C. , care being taken not to exceed this temperature, and to stop the operation before the oxidation is quite complete. As soon as the liquid in the tubes becomes... well saturated with pernitric oxide, the dioxysulphide separates in small crystals. The tubes . Are then to be opened, and the liquid poured into water, which separates a small quantity of the dioxysulphide ; and this, together with the crystals, is washed with boiling water, which removes the oxysulphide, C 2 H 4 SO, that may adhere to them. Further purification may be effected by dissolving the crystals in strong nitric acid, and again separating with water. Dioxysulphide of ethylene separates from its solution in strong nitric acid in small crystals, which under the microscope exhibit the form of prisms with obtuse summits.
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